Decision Follows Court Ruling Ban Unconstitutional

Pennsylvania Gov. Tom Corbett said Wednesday that he wouldn't appeal a court ruling that allowed same-sex marriages in his state, saying an appeal is "extremely unlikely to succeed," even though he remains personally opposed to the unions.

The announcement came on what amounts to the first day of the general election for governor, a race where Mr. Corbett, a Republican, is seen as vulnerable. On Tuesday, businessman Tom...